Hi

Below are 3 sums I can't solve. Please help me!



1. A bookshop was selling some calendars. The bookshop could make a profit of $18 from the sale of each calendar. After selling some calendars, the selling price of the remaining calendars was reduced by $10 each. The number of remaining calendars was 2/3 the number of calendars sold at the original price. The bookshop made a total profit of $2870 after selling all the calendars. How many calendars were sold altogether?

2. Peter had a total of 239 male and female guppies. 3/5 of the male guppies died and he bought 14 more female guppies. As a result, the number of female guppies he had was 1/4 of the number of male guppies. How many more male guppies than female guppies did Peter have at first?


3. Allan had 60 more stamps than Becky. They each gave some of their stamps to their friends. The number of stamps Becky gave away was 2/5 of the number of stamps Allan had at first; the number of stamps Allan gave away was 2/3 of the number of stamps Becky had at first. Both had an equal number of stamps left. How many stamps did Allan have at first?


Thanks!

hongkai14 wrote:
1. A bookshop was selling some calendars. The bookshop could make a profit of $18 from the sale of each calendar. After selling some calendars, the selling price of the remaining calendars was reduced by $10 each. The number of remaining calendars was 2/3 the number of calendars sold at the original price. The bookshop made a total profit of $2870 after selling all the calendars. How many calendars were sold altogether?

2. Peter had a total of 239 male and female guppies. 3/5 of the male guppies died and he bought 14 more female guppies. As a result, the number of female guppies he had was 1/4 of the number of male guppies. How many more male guppies than female guppies did Peter have at first?

3. Allan had 60 more stamps than Becky. They each gave some of their stamps to their friends. The number of stamps Becky gave away was 2/5 of the number of stamps Allan had at first; the number of stamps Allan gave away was 2/3 of the number of stamps Becky had at first. Both had an equal number of stamps left. How many stamps did Allan have at first?
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